Machinery for hardening and straightening saws



PATENTED MAY 2'7 1851.

, H. WATERMAN. Y MACHINERY FOR HARDENING AND STRAIGHTENING SAWS, 6w.

UNITED STATES PATENT OFFICE.

HENRY WATERMAN, or WILLIAMSBURG, NEW YORK.

MACHINERY Fort HABDENING AND STRAIGHTENING SAWS, 8w.

Specification of Letters Patent No. 8,115, dated May. 27, 1851.

at the same time to regularly condenseand harden them is the object of my invention.

The construction isas follows cast iron bed plates are formedof proper dimensions that lettered B in the drawing being for straight saws and C, B, for circular saws, the faces of these beds should be made perfectly level and true and that for the circular saws may have a pin or mandrel projecting up from the center onto which the saw fits while being straightened. From each side of the bed constructed for either purpose standards, checksor guides W, W, project upward parallel with each other and reaching to a proper height for the fall of thedro-p D, or C, D, and are braced by a cross piece C at the top, on each side of the bed are standards (i), to the tops of which are jointed arms or bent levers (Z) by a bolt attaching them by their upper ends, thence the arms hang down a portion of them being bent back at right angles as clearly shown in Fig. 2, in the drawing; at the angles of these levers notches are formed which catch onto projecting fingers or cams (c) and hold them in a horizontal position and prevent their turning, then fingers project over the bed and are secured to the standards (2') by a bolt on which they turn when freed from the levers above named a portion of which also project beyond the line of the standards as clearly represented in Fig. 2, so as to be struck by the drop in its descent and thus free the 'fingersso as to permit them to turn down out of its way. This latter apparatus is for the purpose of sustaining the steel plate above the bed till it is struck by the drop so that no part of the plate shall come in contact with the bed as otherwise it would get chilled and be unfit for the action of the blow upon it. The drop is hung upon one of my improved cat hooks suspended to a cord or chain passing up over a drumP above bywhich it is raised. The

drop consist-s of an oblong or other suitable formed casting D, or C, D, of about half a ton weight. more or less according to the work. to be performed, at either end it isfitted to the guides W above described which steady it in its descent, its under surface is perfectely trued to correspond with the bed.

The operation of this apparatus is as follows the drop is hoisted to its proper position as shown in the drawing and the cams or fingers set, the saw plate sufiiciently heatedis then placed on the fingers at an elevation of some inches above the bed andin a horizontal position and the drop is then let go. In descending it strikes away the lever and fingers and carries down the plate with it striking a powerful blow suflicientto straighten and condense the plate in a proper mannerfor use, making every portion thereof of equable density and perf-ectly stright by which the danger of its afterward becoming warped while using or grinding is obviated. The superiority of the article manufactured by this process is at once determinable on inspection.

Having thus fully described my improvements in the method of straightening and hardening saws &c what I claim therein as new and for which I desire to secure Letters Patent is- The employment of the apparatus above set forth for straightening and hardening steel plates for saws &c at one operation consisting of the fingers or cams substantially as described which support the article to be straightened compressed and hardened, combinedwith and aided by the drop in the manner and for the purpose above specified.

HENRY WATERMAN. Witnesses:

T. C. Donn,

J J. GRENoUeH. 

